I have been using Samsung phones from past 7 years and I could see Samsung providing all sorts of smart phones in lower and higher Range. The difference I could get to now only when I changed my lower end phone with higher end phone Samsung Galaxy note 3. Look and design are almost same for any category of the phone. The screen size increased with some of features like Slow motion, multitasking windows etc. The screen resolution differs slightly.
Even though I spend Rs 30, 000 to buy Samsung high-end phone, the problems remained the same. The battery life is not too good and needs charging in a day, phone gets hanged a lot and had to even replace battery within 9 months of usage. Original battery costed me around Rs 2000 so all in all it was an expensive deal for me for not so good product.